Functions - Mitsubishi Electric MELSEC-Q Series User Manual

3 SPECIFICATIONS

3.2 Functions

Item
Auto tuning function
Auto tuning mode setting function
Forward action/reverse action
selection function
RFB limiter function
Sensor compensation function
Unused channel setting function
PID control forced stop function
Loop disconnection detection
function
Data storage in FeRAM function
Alert function
Control output setting at CPU
stop error occurrence function
Program control function
Cascade control function
Scaling function
SV tracking function
Forced output function
Simplified analog I/O input
function
Parameter change in program
control function
Control function of the Q62HLC
Online module change function
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Table 3.6 lists the functions of the Q62HLC.
Table 3.6 List of functions
• Automatically sets the optimal PID constants for the loop control module.
• Sets the auto tuning mode according to the control target by setting AT (auto tuning)
differential gap and AT additional lag.
• Sets heat control (reverse action) or cooling control (forward action).
• Limits the manipulation value overshoot which frequently occurs when the set value
(SV) is changed or control target is changed.
• Compensates a difference between measured values and actual temperature,
humidity, pressure, flow rate or others, if any, according to the measured status, etc.
• Disables the PID operation of a channel where no control is performed.
• Forcibly stops the PID operation of a channel where the control is being performed.
• Detects an error in the control system (control loop) caused by a load (heater)
disconnection, abnormal external operation device (such as magnet relay), or a Input
Sensor disconnection.
• Reduces the load of a sequence program by storing data in the buffer memory to
FeRAM.
• Monitors the measured value (PV) and alerts the user.
• Selects the control output status (continue or stop) when a stop error occurs in a
programmable controller CPU.
• Performs the control changing the set value, following the time schedule.
• Performs the cascade control using the channel 1 as master and the channel 2 as
slave.
• Scales the measured value and stores it in the buffer memory.
• Prevents a sudden change of the set value (SV) when control is switched.
• Forcibly outputs an analog value of the specified manipulated value (MV) regardless of
the control mode.
• Uses the Q62HLC as a simplified thermocouple/micro voltage input module, analog-
digital converter module, digital-analog converter module by monitoring the measured
value and setting the manipulated value manually.
• Changes a setting in the buffer memory without stopping program control and reflects
the changed value to the control in execution.
• Performs control using the output signal and buffer memory area setting.
• Replaces the module without the system being stopped.
Description
MELSEC-Q
Reference
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
3.2.8
3.2.9
3.2.10
3.2.11
3.2.12
3.2.13
3.2.14
3.2.15
3.2.16
3.2.17
3.2.18
3.2.19
Chapter 7
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